Regulatory Determinations for Priority Contaminants on the Second Drinking Water Contaminant Candidate List
- On this page
- October 2008 Preliminary Regulatory Determination for Perchlorate
- The Second CCL Regulatory Determinations Schedule
- July 2008 Final Regulatory Determinations for Priority Contaminants on the second Contaminant Candidate List
The Safe Drinking Water Act (SDWA), as amended in 1996, directs the Environmental Protection Agency (EPA) to publish a list of contaminants (referred to as the Contaminant Candidate List, or CCL) to assist in priority-setting efforts. SDWA also directs the Agency to select five or more contaminants from the current CCL and determine whether to regulate these contaminants with a National Primary Drinking Water Regulation (NPDWR).
To regulate a contaminant SDWA requires that EPA determine whether:
- The contaminant may have an adverse effect on the health of persons;
- The contaminant is known to occur or there is a substantial likelihood the contaminant will occur in public water systems with a frequency and at levels of public health concern; and
- In the sole judgment of the Administrator, regulation of the contaminant presents a meaningful opportunity for health risk reductions for persons served by public water systems.
EPA published the second CCL (CCL 2) in 2005. In May 2007, the Agency published a Federal Register (FR) notice announcing and requesting comment on its preliminary determinations for 11 of the 51 CCL 2 contaminants. As part of this May 2007 FR notice, EPA also described the available health effects and occurrence information for perchlorate and stated that additional information was needed to more fully characterize perchlorate exposure and determine whether there was a meaningful opportunity for health risk reduction from a perchlorate regulation. In July 2008, and after careful consideration of public comments, EPA published its final determination that no regulatory action is appropriate or necessary for the following eleven contaminants: boron: the dacthal mono- and di-acid degradates: 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE): 1,3-dichloropropene (Telone): 2,4-dinitrotoluene: 2,6-dinitrotoluene: s-ethyl propylthiocarbamate (EPTC): fonofos: terbacil: or 1,1,2,2-tetrachloroethane.
October 2008 Preliminary Regulatory Determination for Perchlorate
The U.S. Environmental Protection Agency conducted extensive review of scientific data related to the health effects of exposure to perchlorate from drinking water and other sources and found that in over 99% of public drinking water systems, perchlorate was not at levels of public health concern. Therefore, based on the Safe Water Drinking Act criteria, the Agency determined there is not a “meaningful opportunity for health risk reduction” through a national drinking water regulation.
The Agency is seeking comment on its preliminary determination not to regulate perchlorate in drinking water at a national level. EPA will make a final determination for perchlorate after considering information provided in the 30-day public comment period.
While fewer than 1% of the drinking water sources have perchlorate levels above the health reference level, EPA is committed to working with states and localities to ensure public health is protected. States have the right to establish and enforce drinking water standards and EPA encourages state-specific situations to be addressed at the local level. EPA intends to issue a health advisory at the time it issues its final regulatory determination for perchlorate, to assist states with their local response.
- October 10, 2008 Federal Register Notice
HTML Version | PDF Version (21pp, 391K, About PDF)- October 17, 2008 Correction to the October 10, 2008 Federal Register Notice
HTML Version | PDF Version (47K, About PDF)
- October 17, 2008 Correction to the October 10, 2008 Federal Register Notice
- Fact sheet PDF (2pp, 43K, About PDF)
October 2008, EPA 815-F-08-009
Date | Regulatory Determination |
---|---|
September 2004 | Stakeholder meeting to provide a program update and to seek input from stakeholders on contaminants being considered for regulatory determinations. |
May 2007 | Announcement of Preliminary Regulatory Determinations for Priority Contaminants on the Second Drinking Water Contaminant Candidate List |
May - June 2007 | 60 day public comment period |
July 2008 | Announcement of Final Regulatory Determinations for Priority Contaminants on the Second Drinking Water Contaminant Candidate List |
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July 2008 Final Regulatory Determinations for Priority Contaminants on the second Contaminant Candidate List
Federal Register Notices
- July 30, 2007 Preliminary Determinations Federal Register Notice
Drinking Water: Regulatory Determinations Regarding Contaminants on the Second Drinking Water Contaminant Candidate List | PDF Version (11 pp, 223K, About PDF)- Fact
Sheet: Announcement of Final Regulatory Determinations for Priority Contaminants
on the Drinking Water Contaminant Candidate List PDF (4pp, 74K, About PDF)
EPA 815-F-08-005
- Fact
Sheet: Announcement of Final Regulatory Determinations for Priority Contaminants
on the Drinking Water Contaminant Candidate List PDF (4pp, 74K, About PDF)
- May 1, 2007 Preliminary Determinations Federal Register Notice
Drinking Water: Regulatory Determinations Regarding Contaminants on the Second Drinking Water Contaminant Candidate List--Preliminary Determinations | PDF Version (2pp, K, About PDF)
Support Documents for Regulatory Determinations Notice
- Regulatory Determinations Support Document for Selected Contaminants from the Second Drinking Water Contaminant Candidate List (CCL 2) PDF (497pp, 9M)
EPA 815-R-08-012
- Chapter 1: Introduction PDF (26pp, 518K)
- Chapter 2: Evaluation of Health and Occurrence Data PDF (30pp, 5M)
- Chapters 3-11 are linked below by contaminant
- Chapter 12: Metolachlor PDF (42pp, 685K)
- Chapter 13: MTBE PDF (76pp, 1M)
- Chapter 14: Microorganisms on the CCL 2 PDF (34pp, 245K)
- The Analysis of Occurrence Data from the First Unregulated Contaminant Monitoring Regulation (UCMR 1) in Support of Regulatory Determinations for the Second Drinking Water Contaminant Candidate List PDF (278pp, 24M)
EPA 815-R-08-013 - The Analysis of Occurrence Data from the Unregulated Contaminant Monitoring (UCM) Program and National Inorganics and Radionuclides Survey (NIRS) in Support of Regulatory Determinations for the Second Drinking Water Contaminant Candidate List PDF (120pp, 6M)
EPA 815-R-08-014
Boron
- Chapter 3: Boron PDF (29pp, 571K)
- Health Effects Support Document for Boron PDF (136pp, 4M)
EPA 822-R-08-002 - Health Advisory for Boron PDF (65pp, 330K)
EPA 822-R-08-013- Summary From the Health advisory for Boron PDF (3pp, 30K)
EPA 822-S-08-003
- Summary From the Health advisory for Boron PDF (3pp, 30K)
Dacthal mono- and di-acid degradates
- Chapter 4: DCPA Mono- and Di-Acid Degradates PDF (39pp, 1M)
- Health Effects Support Document for Dacthal Degradates: Tetrachloroterephthalic Acid (TPA) and Monomethyl Tetrachloroterephthalic Acid (MTP) PDF (89pp, 3M)
EPA 822-R-08-0005 - Health Advisory for Dacthal Degradates: Tetrachloroterephthalic Acid (TBA) and Monomethyl Tetrachloroterephthalic Acid (MTP) PDF (47pp, 221K)
EPA 822-R-08-011
DDE (1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene)
- Chapter 5: DDE PDF (31pp, 707K)
- Health Effects Support Document for 1,1-Dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE) PDF (128pp, 1.21M)
EPA 822-R-08-003
Telone (1,3-dichloropropene)
- Chapter 6: 1,3-Dichloropropene PDF (41pp, 1M)
- Health Effects Support Document for 1,3-Dichloropropene PDF (142pp, 6M)
EPA 822-R-08-008
2,4-dinitrotoluene, 2,6-dinitrotoluene
- Chapter 7: 2,4- and 2,6-Dinitrotoluene PDF (41pp, 735K)
- Health Advisory for 2,4 - and 2,6-Dinitrotoluene PDF (97pp, 566K)
EPA 822-R-08-010
EPTC (s-ethyl propylthiocarbamate)
- Chapter 8: EPTC PDF (27pp, 572K)
- Health Effects Support Document for S-Ethyl dipropylthiocarbamate (EPTC) PDF (56pp, 1M)
EPA 822-R-08-006
Fonofos
- Chapter 9: Fonofos PDF (26pp, 484K)
- Health Effects Support Document for Fonofos PDF (58pp, 1M)
EPA 822-R-08-009
Terbacil
- Chapter 10: Terbacil PDF (28pp, 550K)
- Health Effects Support Document for Terbacil PDF (62pp, 2M)
EPA 822-R-08-004
1,1,2,2-tetrachloroethane
- Chapter 11: 1,1,2,2-Tetrachloroethane PDF (38pp, 973K)
- Health Effects Support Document for 1,1,2,2-Tetrachloroethane PDF (144pp, 3M)
EPA 822-R-08-007 - Health Advisory for 1,1,2,2-Tetrachloroethane PDF (50pp, 270K)
EPA 822-R-08-012- Summary From the Health Advisory for 1,1,2,2-Tetrachloroethane PDF (50pp, 24K)
EPA 822-S-08-001
- Summary From the Health Advisory for 1,1,2,2-Tetrachloroethane PDF (50pp, 24K)